Varieties are regularly monitored as they grow in the quarantine glasshouses. Visual examination is combined with effective diagnosis and detection tools.

Latent diseases

Some diseases develop few or no symptoms in the glasshouse: leaf scald (Xanthomonas albilineans)
, yellow leaf (Sugarcane yellow leaf virus)
and ratoon stunting disease (Leifsonia xyli
subsp. xyli)
come in for special surveillance during quarantine. Detection tests are being developed for these pathogens.